Call transmitter



March 2.7., 1945.;

H. w. Gor-'F CALL TRANSMITTER Filed Dec. 30, 1942 5 Sheets-Sheet 1 5 n n .J 47 m .w 4 F f J W n K mm A.. w J. 6./ H .n o 6 Y n 4 K4 9 vWMnv wrd a B K r a l 3 V MLK N. n K3 .n-w W .L, W. M 2 2. 11 S 3 7, W o o 5 .7x un 0 M Z-W7 H K1 6 m .H .L H .J v 2 W #n uw a y.. ww M /NVENTOR er. H. W. cof-'F dq @de I A T TORNEY March 27, 1945. H. W. GOFF 2,372,268

CALL TRANSMITTER Filed Dec. .30, 1942 5 Sheets-Sheet 2 W @a/M( ,A T roRNEV H. w. GOFF March 27, 1945.

' CALL TRANSMITTER Filed nec. 5o, 1942 5 sheets-sheet s a gff /NVENTOR By H. w. GOFF @(aQM/f A TroRA/EV March 27, 1945. H. w. GOFF 2,372,268

CALL TRANSMITTER Filed Dec. so, 1942 5 vsheets-'sheet 4` /N VEN TOR H.A W. @OFF in the circular row and in relation to one element of the lever mechanism controlling the operation of the pulsing contact; and

Fig. 12 is a detail View showing an element of the gearing mechanism and the cam carried thereby used for returning the operated pins to normal non-operated position following the con'- trol operation of a lever mechanism by the pulsing cam.

In the call transmitter of this invention, a base I` is provided for mounting two upright supports I6 and I1 held in spaced relation at their upper ends by a plate I8 shown in Figs'. 3, 4, 5, 7, 9 and 10 secured at both ends to the supports by. screws i6 in oblique relation to the base I5, the spacer plate I8 having a portion 23 bent at right angles thereto cooperating with a spacer plate or bar 24 best seen in Figs. 4 and 5 for slidably mounting longitudinally movable key members Kl, K2, K3, K4, K5, K6, K1, K8, K9 and KI 0, arranged in two parallelly disposed rows and rlesiliently held in normal position by similar retractile springs 2|. The bar 24 is secured at both ends to the arms 29 and 30 ofplate I8 as `by screws 22, best seen in Figs. 5, 9 and 10, so as to permit the ready assembly and removal of the keys KI, K2, K3, etc. whenever required for adjustment and repairs, a sto-p plate 3l being provided for limiting the movement of the keys to equal distance from normal unoperated position, while a cover plate` 25 is secured at both ends to arms 26 and 21 formed with plate I8 by screws 28, shown in Figs. 2, 4 and 5, this plate -serving for closing a rectangularly shaped opening 32 in a casing 33 housing the transmitter mechanism.

The upright supports I6 and I1 are formed with bearing portions 34 and v35 for rotatably supporting a shaft 36 while serving as spindles for pivotally receiving the bearing portions of Vshaped arms AI and A2 formed integrally with parallelly disposed bars 31 and 31A, shown in Figs. 2, 3, 5, 6, '1,l 9 and 10, bar 31 being disposed in engageable relation with pawl-like members PI, P2, P3, P4, P5, P6, P1, P6, P9 and PIU pivotally mounted on keykmembers KI, K2, K3, K4, K5,v K5, K1, K3, K9 and KI, respectively, with thefree ends of the pawls normally resting on a rod 38 in turn journaled at both ends in upright supports I6 and l1.

Figs. 7A, 9A`and 10A show graphically the lengths of the arcs generated by the bar 31 of duplex bar 31--31A thus formedas effected, for example, by the equidistant operation of key members KI, K5 andKID obtained by the pivoting of pawls PI, P5 and PIU atdiierent points on these keys relative to bar 31 when the latter is in normal position. Fig. 1A shows the bar 31 pivoted at 35 moved from normal to operated position by key KI, an angular distance corresponding to the spacing of six pins 4I disposed ina circular row in supporting rings 43 and 44, best seen in Figs. 2, 6, 6A and 8, ve of these pins to be operated by the movement of two cooperating arms 56 and 5I to form the so-called interdigit space and transmitting one impulse in a manner which will be hereinafter described in detail. Fig. 9A shows'the angular movement of the bar 31 following its operation by pawl P5 pivoted on key K5 equal to ten pins 4I, iive of which areto be operated by the movement of arms 56-5I in addition to the ve impulses to be transmitted, and Fig. 10A shows the angular movement of bar 31 followingits operation by pawl P I il pivoted on key KI 0 equal to fifteen pins 4I rive of which are to be operated by the movement of arms 50-5I in addition to the ten pulses to be transmitted. In practice, for any chosen longitudinal movement of the keys KI, K2, K3, the pivotal points of pawls PI, P2, P3, etc. mounted on these keys are determined by locating such pivotal centers along the stem of the keys to correspond to the arcs at which a ratchet wheel 40, best seen in Figs. 2, 3, 5, 6, and 6A, must be moved so as to position the arm 5G carried thereby with reference to the number of pins 4| corresponding to the digit values oi the keys.

The wheel 40 which forms part of a ratchet mechanism is mounted for free rotation on the shaft 36 and isv provided with one hundred and twenty teeth corresponding to the number of longitudinally movable pins 4I arranged, as above described, in a circular row in the supporting rings 43 and 44, these rings having portions secured to the base I5 and are held in spaced parallel relation to each other by a cylindrical ring element 42, best seen in Fig. 6, while the pins 4I are held frictionally collectively in normal and operated position by two coiled springs 45 encircling the row of pins 4I, as shown in Figs. 2, 3, 6 and 8.

The ratchet wheel 40 carries a cup-shaped member 46 concentric to and projecting beyond the outer surface of ring 43 and to this cupshaped member is secured the end of the outer convolution of a spiral spring 41, best seen in Fig. 6, the inner convolution of which is secured to a sleeve 48 in turn keyed to the shaft 35 for rotating the latter following the operation of ratchet wheel 4U as imparted by a pawl 49 carried by the bar 31A upon the return movement of this bar to normal under the tension of retractile springs RS having one of their ends,

hooked to the V-shaped arms AI and A2 and their other ends to studs ST laterally extending from upright supports I6 and I1, the ratchet wheel 40 being held in each advanced position by a spring-pressed pawl 56 mounted on the rod 38.

An arm 56 shown in Figs. 2, 3, 6, 6A, 8 and diagrammatically in Fig. ll is pivotally mounted diametrically on one side of ratchet wheel 46 and has its free end portion bent at right angles projecting through an opening 5IA (see Fig. 6A) in the wall of this wheel in operative relation with the row of pins 4I, the width of this arm being made suiciently large .to collectively move a. number of pins 4I from normal to operated position as shown at U, UI, U2 and U3 in Fig. 8 in any angular position of the ratchet wheel 4I] to perform a function which will be hereinafter described in detail.

The arms 50 and 5I are each formed with a ring portion concentric to shaft 36, the ring RI of arm 5I having two diametrically opposite cam portions Z and ZI, best seen in Figs. 21, 6, 6A and 8, abutting against the ring portion R2 of arm 50 with the free end of arm 5I twisted to form an inclined surface, best seen in Figs. 3 and 6A, disposed in engageable relation with a pin carried by the bar 31A for imparting a pivotal movement to arm 5I against the tension of its retractile spring T and thereby ,to arm 56 against the tension of its retractile spring TI upon each pivotal downward movement of the duplex bar 31- 31A as effected by the operation of any one of the keys Kl, K2, K3, etc., thus moving a' number of pins 4I in operated` position followed by the movement of the ratchet wheel 40 during the return operation of duplex bar 31-31A under sequent tensioning -of motor `spring 41 causethe .rotation of shatt36 and thereby the rotation of .a gear 51 keyed thereon ,for rotating a. pinion .support 52 and a support 64, the gear 59 enges.n .ing ajpinion 60 secured to the hub of fa, gear 6l .mounted for yfree rotation on shaft. 36 with Ithe gear .6l engaging with a pinion 62 .keyed on one end of a shaft `63 journaled on the upright .sup-

port 64 and a support 65 securedto the base i5.

On the end of 4shaft 63 opposite to pinion 62 is mounted a miter gear 6:6 meshing with la similar :gear 6.1 keyed on a. vertically disposed shaft 68,

this shaft being journa'led at its upper disposed l end in a `horizontally extending portion er `oi an upright support 69, shown `in Figs. 2, 3,l .and 1. secured to the base l5 while the lower ,disposed end of this shaft is journalecl in a bushing resting on an end thrust ,bearing in the `form of a ball 1l, best seen yin Fig. 2.

On .theshaft A68, as shownin Figs. .2, 3, 5, 6 .and 7, is keyed. a one-step cam 18 and a. worm y'l2 engaging .a worm gear 13 mounted 'for free rotation on `shaft 36 and on this Worm gear is pivotally .mounted an angle lever 14,l best seen in Figs. 3 and'7,.having its arm Y extending through an opening inthe wall of Worm gear 1i3 in engageable relation with the pins 4| which Amay be operated, while the arm Y2 of this .angle `lever is vformed with a ring portion R concentric to a sleeve 82 on shaft 36 for engaging in `any angular position of `worm Wheel `13 the 'forked-shaped arm Y4 of a yoke 15, the arm S65 of which engages the one-step cam 18 under the :tension of a coiled spring SG'isee Figs. 6 and "19 actingfagainst the tension of a comparatively light retractile spring SP for the angle lever '14, the yoke being pivotallyim'ounted on a pin .16 journaled in lugs formed with an upright ysupport 11 secured to the base `I`5 while a lug formed with the arm Y5 Vof this yoke serves for 'mounting an insulating stud dy provided for engaging the pulsing contact 53, best seen in Fig. f3.

Orrpin 16 in superposed relation to yoke 1.5, .as shown in Figs. 2, 6 and '1, is mounted a sec- Aond yoke 15X consisting of arms Y6 and Y1, the latter having -an insulating sleeve for engag ing a' shunting lcontact spring 80 under the tenr:sion of a retractile .spring SG1, shown `in Figs. f3

Yand 7, whilethe 'arm Y6 of yoke 15X is Vdisposed in engageable relation with a rimil formed at the outer disposed end of the sleeve 82 mounted 'for sliding movement on the shaft 36. Sleeve 82 is provided with `a second rim element 83 normally engaged by the arm D of an angle lever 14X v.pivotally mounted on lworm gear 13 diametrically. opposite the angle lever` 14, while the arm D2 of angle lever 14X extends throughA an opening in the worm gear 13 in engageable vrelation with a stop arm 85 'secured to the cup-shaped member 46housing the motor `spring 141. The stop arm 85 is formed with -a ,cam vportion C2,

. the function of which is rto actuate the angle lever 14X for moving the sleeve 82 in the position shown in Fig. 3 4and thereby pivoting the -yoke 15X for operating the shunting contact y8l) prior'to the fengagement'of arm 85with the arm D2. of angle lever 14X, such stop determining :the adjusted .normal position of angle 'lever `14 relativa taarm ilfcarried by the ratchet wheel Miami :the resistir. position. of" ann Y oi ansie loveme with any one'of .the pins'lll., as` the case may be. such registry pesitions being shown .in H511.

.Ther speed ratiobetweensear 51 l.on .shaft ,3.6 andmiter. gearsr ,on shaft f68 is .Such as to rotate .the latter shaft and thereby the cam 1.3 keyed vtherenn for leach dil under control of a v:speed governor in the .form of -a .vane wheel VW,

while.- the number .of teeth in worm gear vr1,3 corresponds ;tozthenumber `of vpins .4i or is equal to one hundred .and twenty .turns of .cam 1r. The )norm .gear V13 as 4snpxim in Figs. 3 kand l2 is pro- .yixied with.a-carn '8.0 .Serving to return the operated ninsxfdl .tonqrmaljnon-operated positions following ,engagement by `arm Y of ,angle tener lnoperated, `as' above described, by lthe movement .of yoke 15 and the retractile spring The number .of 4pins .4,1 was chosen 'fforuse nf :the transmitter a seven digit telephone exchange system, 4plus .a number of pins corre spending to .the necessary length of resetting .cam im but the number of vpins used may be .changed for .the setting .of any number of `digit desired, ahead v.of the .controlled operation Lof lthe pulsing mechanism.

fIn va :typical operationof thev .call transmitter fdevice of 1this .invention the .gearing mechanism is :prevented 'from operating under the normal `tension of .motor `spring 4.1 due ,to .the engagement of arm D2 :of angle lever .14X with the stop arm -85 .carried :by the Ycup-shaped member 46 mounted .on the ratchet lwheel 41) .while the angle lever 24X, .thesleeve 82 and .the yoke 15X are held in ynormal operated position Ybythe cam C2 engaging the arm D2 of the :angle lever 14X. In' that posilition the ,pulsing cam 12 is setas to hold'the yoke 15' in position so as to permit the closure of Apulsingspringit53 While :the angle lever 14 isheld by its retractilespring SP in position wherein ithe 'ring fportion R at the end ,of arm Y2 :of this. :angle lever .abuts against the forked larm Y4rofyoke 15 .as shown in Figs.v 2 and 3.

The rnormal. .or starting position of ratchet :wheel 40 :from any .angular position as deter- Amined `by :the retainingvpavvl` 56 is such as to locate the Iarm .50 pivpted thereon in position as showninzFigure ll wherein thesuccessive opera- .tionof this arm by arm 5I will collectively move .sets of ilve pins Il into operated position as 4shown for Aexample by thegroups of pins U, UI,

1U2and U3 in Figs. y and l1 in response to the successive :operation of keys KI, K5 and KID as .will .be hereinafter described in detail, while the normal position of worm .gear v13 and theangle 'lever14carried`thereby relative to arm 50 pivoted -on ratchet wheel40 as determined by theenygagement of the arm D2 of angle lever 14X with arm .85 is such as .to locate the arm Y of angle ilever 14in registry rwith the rst pin oi eachgroup of pins 4I to be moved by the arm 50 in '-engageable relation `with the arm Y of this angle flever.

Considering the .direction of movement of arm Y f501indicated by the arrow in Fig. 1l as imparted 'bythe rotation of ratchet wheel 40 and the con- Isequent rotation of the -zworm .gear 13 relative to -the successive group U, Ul, U2 and U3 vof pins `A4|, the operationof anyone of the key members as, =for example, digit key mem-ber'Kl from normalposition to the position shown in Fig. '1 a distancelimitedbythe stop'plate'3l is effective to impart yan :angular i-movement .to the bars 31.31A through the engagement of pawl PI with the bar 31 corresponding to six teeth of ratchet wheel 40 to cause the operation of this ratchet wheel upon the return movement of bar 31 to normal unoperated position under the tension of retractile springs RS connecting with the arms A2 of this bar following the release of key KI by the operator. The pivotal movement of bars 31--31A as eiected by the operation of key KI, the pin 55 carried by bar 31A, Figs. 2, 3, 5, 6A and 8, is effective to'engage the inclined surface of arm 5I for imparting a pivotal movement to this arm and thereby to arm 50 against the tension of their retractile springs T and TI for moving a set of pins 4I as U, Fig. 1l, from normal to operated position when the movement of key KI, as above described, is arrested by the common stop plate 3I. The release of key KI by the operator and the consequent return movement of this key to normal position under the tension of its retractile spring ZI permit the return movement of bars 31-31A to normal non-operated position under the tension of retractile springs RS, thus =causing the rotation of ratchet wheel through its engagement by the pawl 49 an angular distance corresponding to six of its ratchet teethI and therefore corresponding to six pins 4I while moving the arm 50 from the position U shown in full line in Fig. 11 to the position UI shown in dotted line in that gure and tensioning the motor spring 41 through the tension of retractile springs RS, the return movement of bars :i1-31A being limited by the stop pins A9 engaging the arms A2 of these bars. The rotation of ratchet Wheel 40 as eiected by the pawl 4S carried by bar 31A is effective to cause the disengagement of angle lever 14X from the cam C2 thus permitting the movement of sleeve 82 and that of yoke 15X under the tension of the retractile spring SGI for closing the shunting contact 8%.

The engagement of pawl with ratchet wheel 40 to this advanced position prevents any return movement of this wheel under the tension of spiral spring 41, thus causing the rotation of shaft 36 and gear 51 keyed thereon for rotating the pinion and gear unit 58-59, pinion and gear unit 60-5I, pinion 62 meshing with gear 6I, shaft 53, and mite'r gears 56 and 61, the latter being keyed. to the shaft 58 for rotating the cam I8 and the worm gear 12. The rotation of cani 18, however, is rendered ineifective relative to the yoke 15 and therefore ineffective relativel to pulsing Contact 53 due to the engagement of arm Y- of this yoke with arm Y2 of angle lever 14 and the engagement of arm Y with the successive five pins 4I of group U, while the passing of arm Y of angle -lever 14 in registry with the sixth pin 45 unoperated will permit the movement of this angle lever as eiected by yoke 15 having its arm Y4 in operative relation with the cani, 18. The movement of yoke 15 under the tension of its retractile spring SG causes the operation of pulsing contact 53 once for the group of pins U which is followed by the reengagement of arm D2 of angle lever 14X with the cam C2 of stop arm 85, for operating the angle lever 'MX so as to impart a movement to the sleeve 82 on shaft 36 to cause a pivotal movenient of the yoke 15X and thereby opening the shunting Contact 8D at the end of this digit transmitting operation, the arm 50 carried by ratchet Wheel 40 and the arm Y of angle lever 111 being now in the position indicated in dotted lines at UI in Fig. 11.

The operation of digit key K5, the second digit of the example above referred to, from normal to the position shown in Fig. 9 against the common stop plate 3| is eiective to impart an angular movement to the bars 31--31A for actuating the arm 5I due to the engagement of pin 55 carried by bar 31A and thereby actuating the arm 50 for moving the pins in group Ul in the operated position during the downward movement of bars .S1- 31A an angular distance corresponding to ten teeth of ratchet Wheel 40. The release of the operated key K5 by the operator permits the return of bars 31-31A to normal position under the tension of retractile springs RS for rotating the ratchet Wheel 4D and thereby moving the arm 5B from position UI to position U2 while tensioning the motor spring 41 by the tension of retractile springs RS, themselves tensioned by the downward movement of the operated key K5, the ratchet wheel 4U being held, as above described, against any return movement by the spring pressed pawl 56 mounted on rod 3S, thus causing the operation of shaft 35 and thereby that of pulsing cam 18 and worm gear 13.

The operation of ratchet Wheel 43 as effected by retractile springs RS acting on the bars 31--31A moves the stop arm 85 in advance to the operation of worm gear 13 for releasing the angle lever 14X and thereby permitting the movement of sleeve 32 on shaft 35 as effected by the retractile spring SGI of yoke 15X the movement of which closes shunting Contact 80. The rotation of cam 18, however, during the follow-up movement of Worm gear 13 relative to the ratchet wheel 4D is rendered ineffective relative to pulsing Contact 53 due to the engagement of arm Y2 of angle lever M with the forked arm Y4 of yoke 15, angle lever 14 being itself prevented from operating in response to the movement of cam 1B and retractile spring SP due to the arm Y of angle lever 14 successively engaging the operated pins 4I of group UI. However, upon the passing of arm Y of angle lever 16 in registry with the nonoperated pins of group Ul the arm Y of this angle lever permits the yoke 15 to follow the operation of cam 18 for operating the pulsing contact 53 a number of times corresponding to the number of unoperated pins 4I in the group UI, that is, iive pins when the movement of Worm gear 13 relative to ratchet wheel d is arrested by the stop arm engaged by the arm D2 of angle lever 16X following the operation of this angle levei` by the cam C2 of the stop arm to move the sleeve 82 on shaft 35 and thereby imparting a pivotal movey ment to yoke 15X to cause its arm Y1 to operate the shunting contact 8El, as above describedy in connection with the operation of the transmitter in response to the operation of key KI.

In the group of pins as U and Ui, the pins moved in operated position by the operation of arm 5G, provides the so-called interdigit spaces between the sets of pulses representing the digits of the operated keys so as to control the automatic switches at the telephone exchange in a manner to differentiate between digits transmittedfwhenever the key members KI, K2, K3, etc. are operated at a greater speed than that of the digit transmitting mechanism. For example, supposing that the key KI El is operated for` transmitting ten pulses prior to the completion of the pulsing mechanism in the transmitting of the ve pulses of group U2 above described. The operation of key KID from normal to operated position against the stop plate 3l as shown in Fig. 10 is effective to impart an angular movement to me baresi-#31acorresponding to fifteen teeth of rratchet wheelv 40 While actuating the arm` 5l), as above described, for moving rive pins inthe groupg'oi pins U2 in the operated position. vThe ing the stop arm 85 further angularly away from the arm D2 of angle lever 14X, while further tensioning the motor spring 45 without interfering With the pulsing cam lll now operating for the transmitting of the five pulses in response to the operation of key- K previously operated. Under K this condition the arm D2 of angle lever 14X does not come into engagement with stop arm 85 at the conclusion of the ve pulses transmitted so vthat the sleeve 82, the-yoke X and the'shunting contact 80 are not operated, the opening of such contact occurring only upon the engagement of arm DZ of angle lever 74X with 'stop arm 85 at the end of its pulsing operation in the t'ransmitting of a digit or a plurality of digitsaccording to the speed `at which the digit keys Kl, K2, K3, etc. are operated, the operated pins in the groups U, Ul, U2, U3', etc. being returned to normal unoperated positions bythe cam 90 disposed a small angular distance fromithe arm Y of angle lever 14, as showninFig. 12.

What is claimed is: 4 v l. In a call transmitter, a rotatable shaft, a ratchet wheel mounted for free rotation on said shaft, a pair of integrally formed barsextending transverse of the movement of said ratchet wheel and movable concentric to saidishaft, a set of longitudinally movable key members arranged in rows parallel to said bars, means carried by each of said key members at points thereon for moving said bai` from normal to positions corresponding to the digit values of said key members, a pawl carried by the other of said bars foractuating said ratchet wheel upon the return movement of said bars to normal, spring means for eifecting such return movement, a motor spring tensioned by the movement of said ratchet wheel for actuating said shaft, a pulsing mechanism, means operatively connecting said shaftI to said pulsing mechanism, means actuated by the conjoint variable operation of said bars and said ratchet wheel for controlling the operation of said pulsing mechanism, a shunting contact, means carried by said ratchet wheel cooperating with means actuated by an element of said operatively connect.

ing means' for actuating said shunting contact at the conclusion of each mechanism.

' 2. In a call transmitter, a plurality of key members, a ratchet wheel, a pivoted bar, means carried by said key members for actuating said bar, means carried by said bar for actuating said ratchet wheel, a support, a plurality of movable pins arranged in a row in said support, an arm carried by said ratchet wheel for movement adjacent and coaxial to said'pins in said row,`

means actuated by the pivotal movement of said bar to cause the operation of said arm for moving a predetermined number of said pins in operated position, a motor spring tensioned by the 'operation of said ratchet wheel following the operation of said bar by said key members, a pulsing cam, a gearing mechanism actuated by said motor spring for actuating said cam, means reciprocated by the movement of said cam and successively engaging said operated pins for con trolling the operation of said contact, and means operation of said pulsing.

3. In a call transmitter, upright supports, a'

shaft and a bar mounted on said supports for movement concentric relative 'to each other, longitudinally movable digit key members, means car-v ried by each of said key `rnembersfor operatively engaging said bar, a ratchet wheel mounted for free rotation ori said shaft, a motor spring operatively connectingsaid wheel to said shaft for rotating the latter in a follow-up movement upon the operation'of any one of said key members, a ring-shaped support, a pluralityv of operable elements arranged in a circular row in said support, a pivoted arm carried by said ratchet Wheel,l

having a ring portion concentric tol said shaft,4 a pivoted arm havinga cam? ring concentric to said shaft forjengaging the arm carried by said ratchet wheel in any angular position of the latterl for setting a group of said movablepihs in operated'gposition in response to the operation of each of saidkey members, a pulsing contact,

a gearing mechanism actuated by the rotation of said shaft under the tension of said/motor spring, a cam actuated byv said gearing mechanism, and alever mechanism actuated Vby the operation of said cam and controlled by the pins set by the' operation of said pivoted arm for negativing a corresponding number of operations of said cam to cause the operation of said contact according to the digit of said key members.

4. In a call transmitter, a plurality of movable pins disposed in a circular row, a pivoted bar, a. set of key members having means for actuating said bar, a system of levers and a ratchet wheel operated by said bar for successively setting groups of pins in said row in operated position, a

shaft for suppo-rting said ratchet Wheel, a motor spring tensioned by theoperation of said wheel for rotating said shaft, a gearing mechanism actuated by the operation of said shaft, a cam actuated by said gear mechanism, a pulsing contact, a shunting Contact, an angle lever pivoted on one of the elements of said gear mechanism having one arm disposed in engageable relation with said operated pins and the other arm having a ring portion concentric to said shaft, a support, a yoke member pivoted on said support having one arm engaging said cam and the other arm the ring portion of said angle lever, means carried by said arm for engaging said pulsing contact, another yoke pivoted on said support having one arm engaging said shunting contact, a longitudinally movable sleeve mounted on said shaft `having a* collarA portion engaged by the other arm of the last-mentioned yoke member, and means carried by said gear element and said ratchet Wheel to cause the movement of said sleeve for operating the last-mentioned yoke member to cause the operation of said shunting contact following the operation of said pulsing contact by the movement of said cam in response to the successive operation of said key members.

5. In a call transmitter, a base, a pair of upright supports secured to said base, a shaft journaled in said supports, a bar having arms pivoted on said supports for movement concentric to said shaft, a set of longitudinally movable key members having means for moving said bar in one direction upon the operation of any one of said key members, a retractile spring tensioned by the movement of said bar in said direction, a

ratchet wheel mounted for free movement on said shaft, a pawl for rotating said ratchet wheel upon the movement of said bar in another direction under the tension of said retractile spring, a motor spring for rotating said shaft following the operation of said ratchet Wheel as eiected by the movement of said bar in the last-mentioned direction, a gear train actuated by the movement of said shaft, a cam, and a Worm gear actuated by said gear train, a pulsing mechanism actuated by said cam, a plurality of movable elements mounted in a circular row concentric to said shaft, means carried by said ratchet Wheel operated by the movement of said bar during its movement in the rst-mentioned direction for setting a predetermined number of said pins in operated position, means carried by said Worm gear actuated by the movement of said cam and engaging the pins set by the operation of the means carfied by said ratchet Wheel to render a number of operations of said cam ineiective relative to said pulsing mechanism.

6. In a call transmitter, a pulsing mechanism, a plurality of longitudinally movable digit key members, a common stop element for limiting the movement of said key members to a similar distance, a ratchet mechanism, means pivoted at diierent points on said key members for actuating the driving element of said ratchet mechanism to cause the operation of said driven element angular distances corresponding to the digit values of said key members, a motor spring tensioned by the operation of said driven element, a circular row of pins, a member carried by the driven element of said ratchet mechanism movable concentric to and in position adjacent the pins in said row, means carried by said driving element for operating the member carried by said driven element for moving a number of said pins in position eiective for controlling the operation of said pulsing mechanism according to the operation of each of said key members.

'7. In a call transmitter, a base, a pair of upright supports secured to said base, a set of longitudinally movable digit numbered key members, a mounting secured to said supports having elements for guiding said key members in their movement from normal to equidistant operated position, retractile springs for said keys, a bar pivoted to said supports, means pivoted at dilerent points on said key members for variably actuating said bar upon the successive operation of said key members, spring means tensioned by the operation osaid bar, and a pulsing mechanism actuated by the tension of said spring means and controlled by means operated by the variable movement of said bar.

HAROLD W. GOFF. 

